CN103595443B - The multipath searching method of WCDMA system and system - Google Patents
The multipath searching method of WCDMA system and system Download PDFInfo
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- CN103595443B CN103595443B CN201310574698.3A CN201310574698A CN103595443B CN 103595443 B CN103595443 B CN 103595443B CN 201310574698 A CN201310574698 A CN 201310574698A CN 103595443 B CN103595443 B CN 103595443B
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Abstract
The invention provides a kind of multipath searching method of WCDMA system, comprise step: the power-delay matrix according to the signal of the WCDMA system received searches out peak, and rules out the fat footpath of signal; According to the signal characteristic in fat footpath and auxiliary path position, the main path position in fat footpath is adjusted, obtain new main path position; According to the auxiliary path position that new main path position makes new advances in described auxiliary footpath two-sided search.The present invention also provides a kind of Multipath searching system of WCDMA system, the multipath searching method of above-mentioned WCDMA system and system, first search out peak according to the power-delay matrix of the signal of system and rule out fat footpath, according to the signal characteristic in fat footpath and auxiliary path position, the main path position in fat footpath is adjusted, new auxiliary path position is searched for again according to the main path position after adjustment, obtain main path position and auxiliary path position accurately, thus realize Multipath searching, algorithm complex is low and can ensure the accuracy of Search Results, improve the efficiency of Multipath searching and reduce searching cost.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of multipath searching method and system of WCDMA system.
Background technology
WCDMA (WidebandCodeDivisionMultipleAccess, Wideband Code Division Multiple Access (WCDMA)) usually adopt in system RAKE receiver to carry out receptions process to broadband signal, the location of catching wherein for multi-path location is one of committed step that the final decoding of guarantee signal is correct.In traditional Multipath searching, in order to ensure the uncorrelated of each footpath, between the footpath that search obtains, interval is minimum is 1 chip, but in actual environment, usually there is the situation of many footpaths in a chip, namely there is fat footpath phenomenon.
Traditional Multipath searching algorithm is that the signal of reception is obtained power-delay matrix (PDP:PowerDelayProfile) by carrying out relevant treatment after matched filter with local scrambler, path position information is obtained again by peak value judgement, but due to the existence in fat footpath, peak in PDP can offset, and causes two path positions in fat footpath all can not be located accurately.In order to support higher transmission rate, E-DPDCH (E-DCHDedicatedPhysicalDataChannel is introduced in WCDMA system, transmit ascending data), spreading factor is adopted to be the spreading code of 2, introduce 16QAM (QuadratureAmplitudeModulation, digital modulator) high order modulation technique simultaneously.Therefore in order to resist the impact of coloured noise, need to adopt GRAKE reception technique, this has higher requirement to Multipath searching, and therefore, traditional Multipath searching algorithm is no longer satisfied the demand.
In the existing Multipath searching technology for fat footpath phenomenon, mainly contain three kinds of relevant processing methods, method one, directly carries out position adjustment to two footpaths in fat footpath according to its energy; Method two, the position according to value diameter slow in the morning calculated adjusts; Method three, utilizes interative computation to carry out interference to time-delay power matrix and eliminates, then carry out Multipath searching.Below these three kinds of methods are described in detail:
Method one, when two footpaths lean on very near time, if two footpath energy equivalences, then can only slide to deviating from direction or keep original position, if wherein a footpath is obviously better than another, then powerfully can be free to slide, can only slide to deviating from direction, strong footpath in weak footpath, if weak footpath be too near to powerful and also to slide toward powerful direction time, delete this weak footpath; Method a pair multipath adjustment is very rough, only adjusts according to the energy of multipath, can not ensure that the position in two footpaths is all looked for very accurate.
Method two, multi-path tracing method is used to adjust path position, the path position utilizing conventional multipath search to obtain and before and after it 1/2chip position carry out descrambling and de-spreading process to received signal, and carry out accumulation process and obtain being worth late early, value slow in morning is revised, utilizes the position of value diameter late early to adjust; Method two adjusts path position according to value slow in the morning calculated, and can not resist the impact that fat footpath is brought, and still can not ensure that the position in Xia Liangtiao footpath, fat footpath is all arrived very accurate, and algorithm is comparatively complicated.
Method three, carries out process to received signal and obtains up-sampling signal y with pilot frequency sequence, according to | y|
2global maximum and described global maximum near common M sampled point, interative computation is carried out by using the raised cosine of peak value zero setting, the contribution margin of current multi-path waveform to other multipath waveforms is deducted, obtain the up-sampling signal that in M group up-sampling signal, residual error is minimum, obtain the time delay power spectrum of the minimum up-sampling signal of described residual error; Method three utilizes the raised cosine of peak value zero setting to carry out interative computation to the multiple points near PDP peak value, eliminates current multi-path waveform to the interference of other multipath waveforms, obtain the time delay power spectrum of the minimum up-sampling signal of residual error, then carry out Multipath searching.This algorithm, need to carry out interative computation to each PDP peak value, and carry out secondary Multipath searching in gamut, algorithm is comparatively complicated.
In sum, multipath searching method of the prior art, is difficult under the prerequisite of low algorithm complex, search out multi-path information accurately.
Summary of the invention
Based on this, be necessary for the problems referred to above, a kind of multipath searching method and the system that can search out the WCDMA system of multi-path information accurately under the prerequisite of low algorithm complex are provided.
A multipath searching method for WCDMA system, comprises the steps:
Power-delay matrix according to the signal of the WCDMA system received searches out peak, and rules out the fat footpath of signal;
According to the signal characteristic in fat footpath and auxiliary path position, the main path position in fat footpath is adjusted, obtain new main path position;
According to the auxiliary path position that new main path position makes new advances in described auxiliary footpath two-sided search.
A Multipath searching system for WCDMA system, comprising:
Fat footpath judging module, the power-delay matrix for the signal according to the WCDMA system received searches out peak, and rules out the fat footpath of signal;
Main footpath adjustment module, for adjusting the main path position in fat footpath according to the signal characteristic in fat footpath and auxiliary path position, obtains new main path position;
Auxiliary path search module, for the auxiliary path position made new advances in described auxiliary footpath two-sided search according to new main path position.
The multipath searching method of above-mentioned WCDMA system and system, first search out peak according to the power-delay matrix of the signal of system and rule out fat footpath, according to the signal characteristic in fat footpath and auxiliary path position, the main path position in fat footpath is adjusted, new auxiliary path position is searched for again according to the main path position after adjustment, obtain main path position and auxiliary path position accurately, thus realize Multipath searching, algorithm complex is low and can ensure the accuracy of Search Results, improves the efficiency of Multipath searching and reduces searching cost.
Accompanying drawing explanation
Fig. 1 is the flow chart of the multipath searching method of the WCDMA system of an embodiment;
Fig. 2 is the flow chart of a multipath searching method algorithm examples of WCDMA system;
Fig. 3 is the Multipath searching system configuration schematic diagram of the WCDMA system of an embodiment.
Embodiment
Be described in detail below in conjunction with the embodiment of accompanying drawing to the multipath searching method of WCDMA system of the present invention.
Shown in Figure 1, Fig. 1 is the flow chart of the multipath searching method of the WCDMA system of an embodiment, mainly comprises the steps:
Step S1: the power-delay matrix according to the signal of the WCDMA system received searches out peak, and rules out the fat footpath of signal.
In this step, can being the signal by receiving WCDMA system, obtaining its power-delay matrix (PDP), search out multiple peak according to delay matrix, rule out many footpaths according to peak to exist in a chip, namely rule out and there is fat footpath phenomenon.
In one embodiment, for the processing procedure of step S1, can specifically comprise the steps:
Step S101: the signal of the WCDMA system of reception is carried out filtering by matched filter, and filtered signal and local scrambler are carried out relevant treatment obtain power-delay matrix; Wherein, relevant treatment can comprise the coherent accumulation undertaken by time slot or the noncoherent accumulation carried out frame by frame, thus can on the impact of antinoise on performance.
Step S102: obtain corresponding footpath according to power-delay matrix search peak position, wherein, peak separation is at least 1chip; All peaks can be searched out at 1chip.
Step S103: the power of energy threshold to the footpath of searched peak according to setting is adjudicated, and obtains the fat footpath of described signal; Wherein, can be 1chip by judging continuous two or more footpaths spacing and the energy in footpath is greater than a default threshold value adjudicates fat footpath, the fat footpath ruled out being divided into one group, being used in subsequent step and processing.
Step S2: according to the signal characteristic in fat footpath and auxiliary path position, the main path position in fat footpath is adjusted, obtain new main path position.
In this step, main footpath refers to the footpath that in fat footpath, energy is larger, auxiliary footpath refers to the footpath that energy is less, due to the existence in fat footpath, the peak in power-delay matrix is caused to offset, two path positions in fat footpath all can not be located accurately, accordingly, consider the signal characteristic in fat footpath, under the prerequisite of known system over-sampling rate, peak generation skew is that known quantity is (as 1/2chip, 1/4chip), so can by judging the side-play amount of fat footpath signal characteristic determination peak relative to auxiliary path position, then main path position is adjusted.Adjust above by the main path position of signal characteristic to fat footpath, ensure that the accuracy of the main path position of search.
In one embodiment, being directed to fat footpath is two situations at a distance of the footpath for 1chip of ining succession, and the processing procedure that step S2 adjusts the main path position in fat footpath can be as follows:
By the main path position in fat footpath to the direction skew 1/4chip away from auxiliary path position.
In another embodiment, being directed to fat footpath is in succession at least three at a distance of (namely there is the footpath of three footpath close together in fat footpath for the footpath of 1chip,) situation, the processing procedure that step S2 adjusts the main path position in fat footpath, can specifically comprise as follows:
Step a, calculate the energy ratio in two auxiliary footpaths in described fat footpath, and itself and the threshold value preset are compared; Concrete, can be calculated the energy ratio in two auxiliary footpaths by formula R=α/β, in formula, α is little auxiliary footpath energy, and β is large auxiliary footpath energy.
In addition, in order to avoid the impact in empty footpath, the less auxiliary footpath of energy can be deleted at this, by the energy ratio R in auxiliary footpath and the thresholding preset
compare, if
then enter step b, if
then perform step c; Generally, thresholding
value is between 0.8 ~ 0.9.
If step b energy ratio is less than or equal to default threshold value, then the main path position in fat footpath is offset 1/4chip to the direction, auxiliary footpath larger away from energy.
If step c energy ratio is greater than default threshold value, then the main path position in fat footpath is offset 1/2chip to the direction, auxiliary footpath larger away from energy.
Step S3: the auxiliary path position made new advances in described auxiliary footpath two-sided search according to new main path position.
In this step, can according to the main path position of new definition, in both sides, described auxiliary footpath, setting position searches for the auxiliary path position made new advances.
In one embodiment, according to the main path position of location, the power-delay matrix of each 1chip position, both sides, auxiliary footpath can be revised, eliminates the interference of main footpath to auxiliary footpath, and then search for the auxiliary path position made new advances, specifically comprise as follows:
Step S301: according to new main path position, and utilize the coefficient of raised cosine filter to revise the power-delay matrix of both sides, auxiliary footpath at a distance of the position of 1chip.
Concrete, interference cancellation process is as follows: suppose the rear main footpath peak power P of adjustment
0represent, main footpath peak l after adjustment
0represent, the coefficient of raised cosine FIR filter represents with f, and supposes the position l of main radial direction away from direction, auxiliary footpath skew 1/2chip
1/2represent, then in order to resist the interference of auxiliary footpath to main footpath, main footpath peak value P
0=PDP (l
1/2)/f
2(| l
0-l
1/2|); Suppose to need the power-delay matrix position l in the auxiliary footpath revised to represent, then revised power-delay matrix value is:
Step S302: according to revised power-delay matrix in both sides, auxiliary footpath in the scope of 1chip search peak, and the peak value searched is set to new auxiliary path position.
So far, after each step process above-mentioned, obtaining new main path position and auxiliary path position, preserve, preparing for receiving.
Shown in figure 2, Fig. 2 is the flow chart of a multipath searching method algorithm examples of WCDMA system; This algorithm implementation can comprise the steps:
Step S401, rated output postpones matrix, enters step S402;
Step S402, search peak position, enters step S403;
Step S403, judges whether peak value is fat footpath, if so, enters step S404, if not, enters step S411;
Step S404, judges fat footpath type, if fat footpath type is two then enter step S405 at a distance of the fat footpath for 1chip, if fat footpath type is at least three is the fat footpath of 1chip, then enters step S406 apart;
Step S405, by main path position away from direction, auxiliary footpath skew 1/4chip; Then step S409 is entered;
Step S406, judges energy ratio R and the thresholding preset
size, if
enter step S407, if
enter step S408;
Step S407, by main path position away from direction, auxiliary footpath skew 1/4chip, enters step S409;
Step S408, by main path position away from direction, energy larger auxiliary footpath skew 1/2chip, enters step S409;
Step S409, according to new main path position, revise 1chip position, both sides, auxiliary footpath power-delay matrix, enter step S410;
Step S410, searches for new auxiliary path position according to revised power-delay matrix, enters step S411;
Step S411, preserves new main footpath and auxiliary footpath, wait-receiving mode.
The technical scheme of comprehensive above-described embodiment, by carrying out adjustment and the interference elimination treatment in footpath to fat path position, reduces the complexity of algorithm; Secondly, the feature according to time-delay power matrix adjusts fat footpath, ensure that the accuracy of main path position; Finally, interference is carried out to the value of local time-delay power matrix and eliminates, further ensure the accuracy of auxiliary path position.
Be described in detail below in conjunction with the embodiment of accompanying drawing to the Multipath searching system of WCDMA system of the present invention.
Shown in figure 3, Fig. 3 is the Multipath searching system configuration schematic diagram of the WCDMA system of an embodiment, mainly comprises:
Fat footpath judging module, the power-delay matrix for the signal according to the WCDMA system received searches out peak, and rules out the fat footpath of signal;
Main footpath adjustment module, for adjusting the main path position in fat footpath according to the signal characteristic in fat footpath and auxiliary path position, obtains new main path position;
Auxiliary path search module, for the auxiliary path position made new advances in described auxiliary footpath two-sided search according to new main path position.
In one embodiment, described fat footpath judging module, is further used for:
The signal of the WCDMA system of reception is carried out filtering by matched filter, and filtered signal and local scrambler are carried out relevant treatment obtains power-delay matrix;
Obtain corresponding footpath according to power-delay matrix search peak position, wherein, peak separation is at least 1chip;
The power of energy threshold to the footpath of searched peak according to setting is adjudicated, and obtains the fat footpath of described signal.
In one embodiment, described main footpath adjustment module, is further used for:
By the main path position in fat footpath to the direction skew 1/4chip away from auxiliary path position; Wherein, described fat footpath is in succession two at a distance of the footpath for 1chip.
In one embodiment, described main footpath adjustment module, is further used for:
Calculate the energy ratio in two auxiliary footpaths in described fat footpath, and itself and the threshold value preset are compared; Wherein, described fat footpath is in succession three at a distance of the footpath for 1chip;
If energy ratio is less than or equal to default threshold value, then the main path position in fat footpath is offset 1/4chip to the direction, auxiliary footpath larger away from energy;
If energy ratio is greater than default threshold value, then the main path position in fat footpath is offset 1/2chip to the direction, auxiliary footpath larger away from energy.
In one embodiment, described auxiliary path search module, is further used for:
According to new main path position, and the coefficient of raised cosine filter is utilized to revise the power-delay matrix of both sides, auxiliary footpath at a distance of the position of 1chip;
According to revised power-delay matrix in both sides, auxiliary footpath in the scope of 1chip search peak, and the peak value searched is set to new auxiliary path position.
The Multipath searching system of WCDMA system of the present invention and the multipath searching method one_to_one corresponding of WCDMA system of the present invention, the technical characteristic of setting forth in the embodiment of the multipath searching method of above-mentioned WCDMA system and beneficial effect thereof are all applicable to, in the embodiment of Multipath searching system of WCDMA system, hereby state.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a multipath searching method for WCDMA system, is characterized in that, comprises the steps:
Power-delay matrix according to the signal of the WCDMA system received searches out peak, and rules out the fat footpath of signal;
According to the signal characteristic in fat footpath and auxiliary path position, the main path position in fat footpath is adjusted, obtain new main path position; Adjustment process comprises: by judging that fat footpath signal characteristic determination peak is relative to the side-play amount of auxiliary path position, adjust main path position according to described side-play amount, wherein, described side-play amount is determined by system over-sampling rate;
According to the auxiliary path position that new main path position makes new advances in described auxiliary footpath two-sided search.
2. the multipath searching method of WCDMA system according to claim 1, is characterized in that, the power-delay matrix according to the signal of the WCDMA system received searches out peak, and the step ruling out the fat footpath of signal comprises:
The signal of the WCDMA system of reception is carried out filtering by matched filter, and filtered signal and local scrambler are carried out relevant treatment obtains power-delay matrix;
Obtain corresponding footpath according to power-delay matrix search peak position, wherein, peak separation is at least 1chip;
The power of energy threshold to the footpath of searched peak according to setting is adjudicated, and obtains the fat footpath of described signal.
3. the multipath searching method of WCDMA system according to claim 1, is characterized in that, comprises the step that the main path position in fat footpath adjusts according to the signal characteristic in fat footpath and auxiliary path position:
By the main path position in fat footpath to the direction skew 1/4chip away from auxiliary path position; Wherein, described fat footpath is in succession two at a distance of the footpath for 1chip.
4. the multipath searching method of WCDMA system according to claim 1, is characterized in that, comprises according to the step that the signal characteristic in fat footpath and the corresponding auxiliary path position main path position corresponding to fat footpath thereof adjust:
Calculate the energy ratio in two auxiliary footpaths in described fat footpath, and itself and the threshold value preset are compared; Wherein, described fat footpath is in succession three at a distance of the footpath for 1chip;
If energy ratio is less than or equal to default threshold value, then the main path position in fat footpath is offset 1/4chip to the direction, auxiliary footpath larger away from energy;
If energy ratio is greater than default threshold value, then the main path position in fat footpath is offset 1/2chip to the direction, auxiliary footpath larger away from energy.
5. the multipath searching method of WCDMA system according to claim 1, is characterized in that, the step of the auxiliary path position made new advances in described auxiliary footpath two-sided search according to new main path position comprises:
According to new main path position, and the coefficient of raised cosine filter is utilized to revise the power-delay matrix of both sides, auxiliary footpath at a distance of the position of 1chip;
According to revised power-delay matrix in both sides, auxiliary footpath in the scope of 1chip search peak, and the peak value searched is set to new auxiliary path position.
6. a Multipath searching system for WCDMA system, is characterized in that, comprising:
Fat footpath judging module, the power-delay matrix for the signal according to the WCDMA system received searches out peak, and rules out the fat footpath of signal;
Main footpath adjustment module, for adjusting the main path position in fat footpath according to the signal characteristic in fat footpath and auxiliary path position, obtains new main path position; Adjustment process comprises: by judging that fat footpath signal characteristic determination peak is relative to the side-play amount of auxiliary path position, adjust main path position according to described side-play amount, wherein, described side-play amount is determined by system over-sampling rate;
Auxiliary path search module, for the auxiliary path position made new advances in described auxiliary footpath two-sided search according to new main path position.
7. the Multipath searching system of WCDMA system according to claim 6, is characterized in that, described fat footpath judging module, is further used for:
The signal of the WCDMA system of reception is carried out filtering by matched filter, and filtered signal and local scrambler are carried out relevant treatment obtains power-delay matrix;
Obtain corresponding footpath according to power-delay matrix search peak position, wherein, peak separation is at least 1chip;
The power of energy threshold to the footpath of searched peak according to setting is adjudicated, and obtains the fat footpath of described signal.
8. the Multipath searching system of WCDMA system according to claim 6, is characterized in that, described main footpath adjustment module, is further used for:
By the main path position in fat footpath to the direction skew 1/4chip away from auxiliary path position; Wherein, described fat footpath is in succession two at a distance of the footpath for 1chip.
9. the Multipath searching system of WCDMA system according to claim 6, is characterized in that, described main footpath adjustment module, is further used for:
Calculate the energy ratio in two auxiliary footpaths in described fat footpath, and itself and the threshold value preset are compared; Wherein, described fat footpath is in succession three at a distance of the footpath for 1chip;
If energy ratio is less than or equal to default threshold value, then the main path position in fat footpath is offset 1/4chip to the direction, auxiliary footpath larger away from energy;
If energy ratio is greater than default threshold value, then the main path position in fat footpath is offset 1/2chip to the direction, auxiliary footpath larger away from energy.
10. the Multipath searching system of WCDMA system according to claim 6, is characterized in that, described auxiliary path search module, is further used for:
According to new main path position, and the coefficient of raised cosine filter is utilized to revise the power-delay matrix of both sides, auxiliary footpath at a distance of the position of 1chip;
According to revised power-delay matrix in both sides, auxiliary footpath in the scope of 1chip search peak, and the peak value searched is set to new auxiliary path position.
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| CN101022280A (en) * | 2006-12-15 | 2007-08-22 | 清华大学 | Orthogonal lower mixing frequency digital template matching pulse ultra wide band radio signal receiving method |
| CN101183881A (en) * | 2007-12-11 | 2008-05-21 | 华为技术有限公司 | Multipath search method and apparatus, signal reception processing method and Rake receiver |
| CN102904605A (en) * | 2012-09-25 | 2013-01-30 | 京信通信系统（中国）有限公司 | Method and device for determining multipath information and rake receiver |
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| KR100453811B1 (en) * | 2001-11-30 | 2004-10-20 | 한국전자통신연구원 | Apparatus for searching multipath in spread spectrum cummunicatios and method thereof |
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| CN101022280A (en) * | 2006-12-15 | 2007-08-22 | 清华大学 | Orthogonal lower mixing frequency digital template matching pulse ultra wide band radio signal receiving method |
| CN101183881A (en) * | 2007-12-11 | 2008-05-21 | 华为技术有限公司 | Multipath search method and apparatus, signal reception processing method and Rake receiver |
| CN102904605A (en) * | 2012-09-25 | 2013-01-30 | 京信通信系统（中国）有限公司 | Method and device for determining multipath information and rake receiver |
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